Leveling attachment to squares.



No. 799,601. PATENTED SEPT. 12, 1905. J. A. HOPEWELL.

LEVELING ATTACHMENT T0 SQUARES.

APPLICATION FILED NOV. 16, 1904.

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ANOHEW. a. GRAHAM co. Puovo-umocmrmns. minimum. D c.

UNITED STATES PATENT OFFICE.

JOHN A. HOPEWELL, OF ARNPRIOR, CANADA, ASSIGNOR TO WILLIAM HENRY HARRIS AND JAMES GILBERT GERALD], OF GLASGOW STATION, ONTARIO, CANADA.

LEVELING ATTACHMENT TO SQUARES.

Specification of Letters Patent.

Patented Sept. 12, 19b5.

Application filed November 16,1904. Serial No- 233,040.

To all whom it may concern:

Be it known that I, JOHN ANDERsoN HOPE- wuLL, of Arnprior, in the county of Renfrew, in the Province of Ontario and Dominion of Canada, have invented certain new and useful Improvements in Leveling Attachments to Squares; and Ido hereby declare that the following is a full, clear, and exact description of the same, reference being bad to the accompanying drawings, forming a part hereof.

My invention, which will be hereinafter fully set forth and claimed, relates to devices for attachment to a steel square by which it is converted into a level or plumb-rule.

The object of my invention is an attachment to a carpenters or masons square by which the latter is converted into a level or plumbru e.

Figure 1 shows my device attached to a square and ready for use as a level. Fig. 2 shows the square with device attached to a rule, so as to provide a longerbase and ready for use as a plumb-rule. Fig. 3 shows my device in perspective detached and folded for port'- ability.

Two limbs A and B each have one end a and Z) bent at 2 and hinged to one another by a pivot 3, forming a joint and having its axis in the plane of the angle. The limb end a forms the same angle with its shank A as the end 6 forms with the shank B, and must be such that the shanks A and B form a right angle with each other, the jointed bent ends a and .7) forming the connection between them. The joint 3 is not essential to the operation or effectiveness of the device, but is adopted to make it more portable when not in use than a stiff structure without a joint would be. For this reason the outside (imaginary) angle at 2 is preferably half a right angle. Instead of the angle at 2 the jointed ends might be curved in the shape of quadrant.

The butt-ends a b of the shanks A and B are slotted (one, 6, may be mortised, as shown) to receive and engage the legs of a steel square O. Thumb-screws D are provided in the sides of the slotted parts for firmly clamping the shanks upon the square. At a definite distance from the inner shoulders a b of the slot or mortisesix inches is a convenient measurean eye Iis provided on the inner face of each limb, preferably, but not necessarily, on the shank and near the angle 2, a rib o B being formed which contains the eye 4 and extends into and strengthens the bent part.

A plumb-bob E, havingahook e on a cord or chain a of such length that when suspended from the eye 4: the point 6 comes into close proximity with the inner edge of the square O, is provided.

If the two limbs represent a twelve-inch square and the center of the eye 4: on each limb is six inches distant from the shoulders a 6 respectively, the shanks A and B must be secured upon the twelve-inch marks on the square. Then if used as a level, as shown in Fig. l, the pointcof the plumb-bob suspended from the eye 4 in the rib b will coincide with the corresponding six-inch mark on the baseleg of the square when said base is on a true level line. If reversed and the base-leg is placed upright and the plumb-bob shifted from the shank B to the shank A, as in Fig. 2, the point e of the plumb-bob must then coincide with the six-inch mark on this leg of the square which has now resumed the horizontal position. To provide a longer base, the square C may be secured to a straight-edge or rule, such as F. (Shown in Fig. 2.) In such a case it is convenient to form a groove 5 in one of the edges and insert therein one leg of the square, care being taken that the groove 5 is of uniform depth and the edge of the square is in close contact with the bottom of the groove, so as to secure true parallelism. Agap 6 may be cut in the grooved edge to provide room for "the end of one of the shanks. For convenient handling it is also necessary to provide some mode of connection between the square and the straight-edge, such as may be found in the clamp G, with thumb-screw g firmly connecting the square O and the straight-edge F.

I claim as my invention- 1. The combination of a straight-edge having one edge grooved and gapped, a square having one leg inserted in said groove, a clamp connecting said square to said straight-edge, a pair of limbs connected at a right angle by a bent end on each which are foldably jointed and each limb havingaslotted butt-end adapted to engage one leg of said square at a definite distance from the angle, and each having a rib with an eye formed on its inner side at a definite distance from the shoulder of the said slots, thumb-screws at said slotted ends to secure the connections with the square, and a plumb-bob suspendable from one or the other of said eyes in said ribs, substantially as set forth.

2. The combination of a straight-edge, a square removably attached thereto, a pair of hinge-jointed limbs having their slot-ted buttends firmly but removably secured to definite positions on said square one on each leg to form a right angle with each other and having ribs with eyes formed on the inner edges of the limbs at the same definite distance from the shoulders of the slots, and a plumb-bob suspendable from said eyes, substantially as set forth.

3. The combination of a square, a pair of limbs eachhaving one end bent and the bent ends jointed by a pivot so that the shanks of said limbs stand at a right angle and may be folded and each having a rib with an eye formed on its inner side at a definite distance from the shoulder of the slot and having slots in the butt-ends of said shanks engaging the square at a definite mark thereon, thumbscrews securing said slotted ends to the square, and a plumb-bob suspendable from said eye, substantially as set forth.

4. The combination of a pair of limbs, each havinga bent end pivotally jointed to the other so that said limbs stand at a right angle and are foldable and each having a slot in the buttend of the shank adapted to engage a square and each having a rib formed with an eye on its inner side at a definite distance from the shoulder of said slot, a thumb-screw at each slotted end adapted to impinge upon the square when inserted in said slot and a plumb-bob suspendable from said eye, substantially as set forth.

5. The combination of a pair of limbs jointed at one end to be foldable and to be extended at a right angle toeach other and having a slot at the butt-end of each limb adapted to em gage a square, and each having an eye formed on the inner side of each limb at a definite distance from the shoulder of the slot, and means of securing said slotted ends of the limbs to a square when so engaged, substantially as set forth.

In testimony whereof I have signed in the presence of the undersigned witnesses.

J. A. HOPEWELL. Witnesses:

A. HARVEY, E. M. DoNALDsoN. 

